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Specifies the extend direction for radio list cells.
example
//This example creates a radio button list cell.
var cellType2 = new GC.Spread.Sheets.CellTypes.RadioButtonList();
cellType2.items([{text:"a",value:1},{text:"b",value:2},{text:"c",value:3}]);
cellType2.direction(GC.Spread.Sheets.CellTypes.Direction.vertical);
activeSheet.getCell(2, 2).cellType(cellType2);
• horizontal = 0
Specifies item extend by horizontal.
• vertical = 1
Specifies item extend by vertical.